A leakage test was conducted on the secondary system of the alternative cooling system for the Spent Fuel Pool. (11:15 May 30) A trial run of the secondary system was started. (15:02 May 30) – Fresh water (about 53t) was injected into the Spent Fuel Pool of Unit 2 via the Fuel Pool Cooling and Clean-up Line. (From 12:06 till 13:52 May 30)

Injection of water into the Unit 2 reactor via a pump of the Fire Extinguishing Line was suspended (and injection of water was continued using the Feedwater System (about 5m3/h)). (18:05 May 30) – The accumulated water in the basement of the turbine building of Unit 6 was transferred to a temporary tank. (From 10:00 till 17:30 May 30)

Removal of rubble (an amount equivalent to 7 containers) was carried out using remote-controlled heavy machinery. (From 09:00 till 16:00 May 30) – Oil leakage was confirmed on the surface of the sea near the Curtain Wall of the Intake Canal of Units 5 and 6, in the dedicated port of Fukushima Dai-ichi NPS. (Around 08:00 May 31)

In a separate report there was a loud “impact sound” heard at the Fukushima plant yesterday. Tokyo Electric Power Co. Inc. (TEPCO) confirmed that the impact sound was made when an oxygen tank buried under the rubble was broken. On-site NISA’s nuclear inspectors also confirmed the cause. No one was injured and this will have no impact on the work going forward.